http://jenkov.com/rss/rss_all.jsp News from Jenkov.com about new releases, new articles etc. en http://tutorials.jenkov.com After about 18 months in action http://tutorials.jenkov.com now has 172 texts about Java, Flex and other software development related topics. That is an average of about 10 texts per month. I hope to be able to keep the flow of tutorials coming at the same speed in the future! Send me suggestions by email and I'll see what I can do. http://tutorials.jenkov.com 2009.07.01 http://tutorials.jenkov.com/java-persistence/advanced-connection-and-transaction-demarcation-and-propagation.html The Java Persistence tutorial has been extended with a text explaining a more advanced way of demarcating the life span of connections and transactions in JDBC. It is this method that will soon be implemented in Butterfly Persistence, by the way. http://tutorials.jenkov.com/java-persistence/advanced-connection-and-transaction-demarcation-and-propagation.html 2009.06.29 http://tutorials.jenkov.com/flex-tetris/conceptual-implementation.html The Flex Tetris tutorial has been enriched with a new text explaining how to implement Tetris conceptually, meaning the rules and pseudo code behind the game. It is explained in a programming language independent fashion, so JavaFX programmers can also benefit from it. http://tutorials.jenkov.com/flex-tetris/conceptual-implementation.html 2009.06.23 http://tutorials.jenkov.com/ood/understanding-dependencies.html Have you ever read a text online saying that "factories and interfaces = 100% decoupling" ? This is nonsense! You can't write a sane application without dependencies. All you can do is to make either looser or tighter couplings. This text examines the topic of dependencies a step deeper than the "classes vs. interfaces" discussion it usually revolves around, and it could possibly be taken even further, with your input. So check it out now, and let me know what you think. http://tutorials.jenkov.com/ood/understanding-dependencies.html 2009.06.16 http://tutorials.jenkov.com/dependency-injection/the-opportunities-missed-by-annotation-based-dependency-injection.html There has been a lot of fuss lately regarding the @Inject JSR. Personally, I think that we are missing out on a lot of opportunities by using annotations to configure dependency injection containers. In this text I explain how and why. http://tutorials.jenkov.com/dependency-injection/the-opportunities-missed-by-annotation-based-dependency-injection.html 2009.06.09 http://tutorials.jenkov.com/api-design/design-for-easy-configuration.html The eighth text in the API design tutorial discusses why it is a good idea to think hard about what configuraiton mechanism you choose for your API. http://tutorials.jenkov.com/api-design/design-for-easy-configuration.html 2009.06.03 http://tutorials.jenkov.com/api-design/design-for-testing.html The seventh text in the API design tutorial discusses why it is a good idea to think testing into the design of your API, and gives a few tips about how to do it. http://tutorials.jenkov.com/api-design/design-for-testing.html 2009.06.03 http://tutorials.jenkov.com/api-design/avoid-external-dependencies.html The sixth text in the API design tutorial discusses why it is a bad idea to include external dependencies in your API. http://tutorials.jenkov.com/api-design/avoid-external-dependencies.html 2009.06.03 http://tutorials.jenkov.com/api-design/dont-force-the-user-to-assemble-components.html The fifth text in the API design tutorial discusses why it is a bad idea to force the user to assemble the components of your API, even if the user is using a dependency injection container. http://tutorials.jenkov.com/api-design/dont-force-the-user-to-assemble-components.html 2009.06.03 http://tutorials.jenkov.com/api-design/central-point-of-access.html The fourth text in the API design tutorial discusses why it is a good idea to provide one (or a few) central point of access to the API. http://tutorials.jenkov.com/api-design/central-point-of-access.html 2009.06.03 http://tutorials.jenkov.com/api-design/optional-abstractions.html The third text in the API design tutorial discusses why you should consider making your abstractions optional. http://tutorials.jenkov.com/api-design/optional-abstractions.html 2009.06.03 http://tutorials.jenkov.com/api-design/provide-sensible-defaults.html The second text in the API design tutorial discusses why it is a good idea to provide sensible defaults in your API's components, from a usability point of view. http://tutorials.jenkov.com/api-design/provide-sensible-defaults.html 2009.06.03 http://tutorials.jenkov.com/api-design/dont-expose-more-than-necessary.html The first text in the API design tutorial discusses why you should not expose more than necessary of the internals of your API. http://tutorials.jenkov.com/api-design/dont-expose-more-than-necessary.html 2009.06.03 http://tutorials.jenkov.com/api-design/index.html Having developed API's for about 8 years now, some of that time open source API's like Butterfly Components, I have put together a few guidelines for API design. I am writing these down in this trail both for myself to remember, and as inspiration for anyone else interested. It is currently 9 texts with 9 different guidelines. http://tutorials.jenkov.com/api-design/index.html 2009.06.03 http://butterfly.jenkov.com Version 5.1.15 contains support for connection and transaction scoping. via the ScopingDataSource. This is something that can otherwise be quite messy to handle yourself. http://butterfly.jenkov.com/21 2009.07.01 http://butterfly.jenkov.com In this version it has been made a lot easier to map components to URL's. http://butterfly.jenkov.com/21 2009.06.29 http://butterfly.jenkov.com Version 5.1.14 contains support for creating and upgrading databases from within your application (or a separate application if you like). http://butterfly.jenkov.com/20 2009.06.29 http://butterfly.jenkov.com Version 2.9.9 contains support for using Butterfly Container as an internationalization mechanism for both components and texts. http://butterfly.jenkov.com/19 2009.06.29 http://jenkov.com/book-reviews/dependency-injection.html I as approached by Manning Publications and asked if I would be interested in writing a book review of their upcoming book "Dependency Injection" by Dhanji R. Prasanna. Being the developer of the dependency injection container for Java, Butterfly Container, and having written about dependency injection before, I was naturally interested in what this book had to offer. It turned out to be a very good book. Want to know more about this book? Then go ahead and read the review now! http://jenkov.com/book-reviews/dependency-injection.html 2009.02.19 http://scriptdraw.com Version 1.2.0 of ScriptDraw.com - the free online SVG editor - contains buttons for left, right, up and down arrows. These arrows are generated using the SVG path element. http://scriptdraw.com/3 2009.04.03 http://scriptdraw.com Version 1.1.10 of ScriptDraw.com - the free online SVG editor - contains support for "undo", meaning it is now possible to undo the last 20 actions. In addition, buttons have been added for inserting SVG for basic shapes (rect, circle, ellipse, line etc.). Finally, all buttons have now also been given keyboard shortcuts. These are visible when you hover the mouse over the buttons, in the tooltips. These changes make ScriptDraw a lot easier to work with! http://scriptdraw.com/2 2009.02.03 http://scriptdraw.com ScriptDraw is a simple free online SVG editor. You type in the SVG XML and press a button to see the SVG image as it is rendered in your browser. More features will be added in the future. http://scriptdraw.com/1 2009.01.15